There is a good birdwatching Group uk.rec.birdwatching so I suggest you try
there. However I think they will tell you it is a female or juvenile
Redstart or Black Redstart

R.

bob wrote in message ...
no pics I'm afraid.

Roughly, sparrow sized, maybe a tiny bit bigger. Mostly all brown to
grey-brownish but appeared to have a dull orange flash on the
underside of its tail.

Bit of tail-wagging was going on but I think that might have been an
expression of irritation with my presence.

Does this sound familiar?